'; echo("Trace Output:
"); echo 'zurück'; echo '
';           
      //check target IP or domain
      if ($unix) 
      {
         system ("traceroute $host");
         system("killall -q traceroute");// kill all traceroute processes in case there are some stalled ones or use echo 'traceroute' to execute without shell
      }
      else
      {
         system("tracert $host");
      }
      echo '
'; echo 'done ...'; } else { echo ''; echo '

Your IP is: '.$ip.'

'; echo '
'; echo 'zurück'; echo ' Enter IP or Host '; echo ' '; echo '
'; echo '
'.$system.''; echo ''; } ?>